Sunglasses a function is the most important anti glare, avoid ultraviolet radiation harmful rays entering the eye too much, cause harm. Especially in the outing, cheap ray bans sunglasses, first, regulatory burdens can alleviate eye ciliary muscle in bright light, let the human see objects in the habits of the natural light, this time is the time, the human eye is most comfortable second, wearing sunglasses is not only in order to block the harmful light, at the same time, in the windy weather also, it can prevent the dust particles into the person's eyes, which to some extent, has also become the eyes of the best shelter. According to the statistics, since 1996, the sunspot activity is more and more frequent, resulting in the UV damage on the human body is also growing, especially in our country, such as Qinghai Tibet plateau area due to long hours of sunshine, so here is the most vulnerable to UV damage, therefore, people living in these areas in particular should wear sunglasses.